All Questions
181 questions
5
votes
2
answers
357
views
How to make sure whether the vertical line in the given plot are artifacts or real solutions?
I have the Root[...] function in terms of a real positive $x$ variable, for which the code is given below.
I plotted this function for $0<x<300$, and I get ...
- 63
1
vote
1
answer
111
views
Two-dimensional Density Plot
The function r(a) is the solution of a differential equation $r(a)=\frac{3\epsilon/4}{3(1-3\alpha)-3\epsilon/4}a^{-\frac{3\epsilon}{4}}
+a^{(1-3\alpha)-\epsilon}$ and is given in terms of two ...
- 61
1
vote
0
answers
31
views
Understanding strange numeric behavior of "Plot" command [duplicate]
I have the following cumbersome expression which I wish to plot:
...
- 603
2
votes
2
answers
182
views
When trying to graph a 2D Fourier transform - cannot evaluate numerically
I am trying to graph the 2D Fourier transform of the function:
(x + I y) BesselJ[1, Sqrt[x^2 + y^2]].
However, I noticed that upon trying to evaluate this function, ...
- 23
0
votes
1
answer
166
views
Poincare section and chaos
I have the following system of differential equations :
...
0
votes
0
answers
74
views
How to evaluate Ginsh in Plot3D
I have a function F[x,y] containing multiple polylogarithms $G$ that can be evaluated numerically via GiNaC within the command Ginsh.
If say (toy example),
...
- 510
0
votes
1
answer
54
views
ContourPlot does not draw intersection point and draws ragged plots [closed]
I have the following implicit equation:
$$
M^{-2\frac{\gamma-1}{\gamma+1}}(r)+\frac{\gamma-1}{2}M^{\frac{4}{\gamma+1}}(r) = \frac{g(r)}{g_0}\left( M_0^{-2\frac{\gamma-1}{\gamma+1}}+\frac{\gamma-1}{2}...
- 4,066
4
votes
3
answers
376
views
How to make Mathematica plot for a very small region?
I have the following data that I would like to plot using ListPlot.
...
- 451
1
vote
0
answers
90
views
Adapt Code to Solve Fractional-Order System Delay Differential Equations- Chen System
Dynamics of fractional-ordered Chen system with delay
I have tried to modify this code
...
- 11
0
votes
0
answers
48
views
NSolve produces large coefficients in Roots[...] result
I'm attempting to plot a function's derivative approximation but encountering numerical errors. The issue seems to stem from NSolve generating large coefficients. I'm unsure how to fix it. Any advice ...
- 133
2
votes
1
answer
140
views
Graph of an ergoregion
I'm trying to graph the region defined by the following equation (which comes from the $g_{00}$ element of the metric (2.1) in this paper)
$$ g_{00}=-f H+H^{-1} \omega^2 r^2 \sin ^2 \theta $$
which in ...
- 169
0
votes
3
answers
108
views
How to Plot in a tiny interval, avoiding "must have distinct machine-precision numerical values" error?
Edit even simpler example which appears impossible to make work:
Plot[x, {x, 1, 1 + 10^-13}]
The following code fails with ...
- 6,953
0
votes
0
answers
129
views
NDSolve gives High Oscillatory Solution [duplicate]
I want to solve a differential equation of second order with complex initial conditions.
...
2
votes
3
answers
65
views
In the given code, how can I ask Mathematica to replace the obtained points in function $g$ and plot it?
I obtain a set of points which are the solutions of f[b, c, d] == 0 by this code
...
- 63
0
votes
1
answer
185
views
Plot roots of polynomials [closed]
I am a newbie with Mathematica.
I would like to simulate/plot the distribution of the roots of both the polynomials and the derivatives of polynomials. In particular, I would like plot the ...
- 101